1. Photosynthesis

2. Bell Work
Explain why the pigments in the chlorophyll extract moved up the paper and the pigments in the red cabbage extract did not.

3. Objectives List the stages of the photosynthetic process
Identify the inputs and outputs of
light dependent and independent photosynthetic reactions
Explain why Calvin cycle is light independent

4. Key Terminology Saturation Thylakoid Membrane Stroma Calvin cycle
Photosynthetic electron transport
Glyceraldehyde-3-phosphate

5. Chloroplast -Site of Photosynthesis in Plants
Structure of the chloroplast
Outer membrane
double membrane
Thylakoid membranes
internal membranes
site of photosynthetic electron transport
Stroma
thick fluid that surrounds the thylakoid membranes
site of Calvin cycle

6. Stages of Photosynthesis
Stage 1: Absorption of sunlight
Stage 2: Light-dependent reactions involving photosynthetic electron transport
Stage 3: Light-independent reactions involving the Calvin cycle

7. Absorption of Light
The rate of photosynthesis changes with light intensity
As the light intensity increases
the photosynthetic rate increases
until it saturates with light (when the curve plateaus)
At the point of saturation
the pigments cannot absorb any more light
light intensity

8. Stage 2 Photosynthetic Electron Transport (Light-Dependent Reactions)
Location: Thylakoid membrane
Function: Converts the light captured to chemical energy
Captured light excites electrons that move through the electron transport chain
Energy from the movement of electrons
is used to make chemical energy
ATP and NADPH

9. Photosynthetic Electron Transport

10. Light Dependent Reaction Animation

11. Why is it called the Light Dependent Reactions?
Light directly interacts with the
Electron Transport Chain
Light causes the electrons to move through the chain

12. PROPERTY OF PIMA COUNTY JTED, 2010
Think-Pair-Share
Why can’t humans live without photosynthetic electron transport?
3. Think-pair-share
teacher presents a question
teacher gives wait time for student to form answer
teacher instructs students to share their answer with a partner
teacher calls on non-volunteers to share with the class
PROPERTY OF PIMA COUNTY JTED, 2010 3

13. Photosynthetic Electron Transport
Inputs: Light, H20, ADP, and NADP+
Outputs: ATP, NADPH, O2
ATP and NADPH
used by the light independent reactions
to make food for the plant

14. Stage 3 Calvin cycle (Light Independent Reactions)
Location: Stroma
Function: To produce energy rich sugar glyceraldehyde-3-phosphate that provides carbon skeletons to make glucose
Inputs: CO2, ATP, NADPH
Outputs: glyceraldehyde-3-phosphate, ADP, NADP+
Remaining carbon used to keep the cycle going

15. Calvin Cycle

16. Light Independent Reactions Animation

17. Purpose of CO2 Calvin Cycle “fixes” CO2
CO2 provides carbon for the production of glucose

18. Why is the Calvin Cycle called the Light Independent Reactions?
Because light does not interact directly with the cycle

19. PROPERTY OF PIMA COUNTY JTED, 2010
Think-Pair-Share
Global Warming is due to the increase in CO2 due to burning fossil fuels. To combat this, environmentalists suggest planting trees. Why?
3. Think-pair-share
teacher presents a question
teacher gives wait time for student to form answer
teacher instructs students to share their answer with a partner
teacher calls on non-volunteers to share with the class
PROPERTY OF PIMA COUNTY JTED, 2010 3

20. PROPERTY OF PIMA COUNTY JTED, 2010
3 Minute Paper
Explain the relationship between photosynthetic electron transport and the Calvin cycle.
Be prepared to share.
29. Minute paper or Quick Write
teacher provides a prompt from the lesson
students have one minute to write down a summary of the key points
students compare with a partner
teacher uses a strategy to check all
PROPERTY OF PIMA COUNTY JTED, 2010 20

21. Answer the following questions in complete sentences and IYOW
Draw two rectangles. Label one rectangle PSET and the other rectangle Calvin Cycle. Show the inputs and outputs for each biochemical process. Identify the products that are outputs for PSET and Inputs for Calvin cycle
Explain why PSET is light dependent and Calvin Cycle is Light independent.
What happens to the photosynthetic rate when the plant becomes saturated with light?
What is the purpose of CO2?
Explain where PSET and Calvin cycle are located within the chloroplast.